NE40E BFD for OSPF down on Eth-Trunk

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transparent.gif Issue Description

NE40E-1 and NE40E-2 connect with each other with port Eth-Trunk 10. BFD for OSPF not work well on Eth-Trunk interface, when one of  member port down, OSPF peer rebuild.

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transparent.gif Alarm Information


Mar 30 2018 11:47:04 NE40E_V6R7 %BFD/4/STACHG_TOUP(l)[0]:Slot=1,Vcpu=0;BFD session changed to Up. (SlotNumber=1, Discriminator=8210, FormerStatus=Down, Applications=OSPF, BindInterfaceName=Eth-Trunk10, ProcessPST=False, PeerIp=12.1.1.1, SessType=D_IP_IF, RemoteDiscriminator=8210)
Mar 30 2018 11:47:03 NE40E_V6R7 %OSPF/4/NBR_CHANGE_E(l)[1]:Neighbor changes event: neighbor status changed. (ProcessId=1, NeighborAddress=12.1.1.1, NeighborEvent=LoadingDone, NeighborPreviousState=Loading, NeighborCurrentState=Full)
Mar 30 2018 11:47:03 NE40E_V6R7 %OSPF/4/NBR_CHANGE_E(l)[2]:Neighbor changes event: neighbor status changed. (ProcessId=1, NeighborAddress=12.1.1.1, NeighborEvent=ExchangeDone, NeighborPreviousState=Exchange, NeighborCurrentState=Loading)
Mar 30 2018 11:47:03 NE40E_V6R7 %OSPF/4/NBR_CHANGE_E(l)[3]:Neighbor changes event: neighbor status changed. (ProcessId=1, NeighborAddress=12.1.1.1, NeighborEvent=NegotiationDone, NeighborPreviousState=ExStart, NeighborCurrentState=Exchange)
Mar 30 2018 11:47:03 NE40E_V6R7 %OSPF/4/NBR_CHANGE_E(l)[4]:Neighbor changes event: neighbor status changed. (ProcessId=1, NeighborAddress=12.1.1.1, NeighborEvent=2WayReceived, NeighborPreviousState=Init, NeighborCurrentState=ExStart)
Mar 30 2018 11:46:57 NE40E_V6R7 %OSPF/4/NBR_CHANGE_E(l)[5]:Neighbor changes event: neighbor status changed. (ProcessId=1, NeighborAddress=12.1.1.1, NeighborEvent=HelloReceived, NeighborPreviousState=Down, NeighborCurrentState=Init)
Mar 30 2018 11:46:54 NE40E_V6R7 %BFD/4/STACHG_TODWN(l)[6]:Slot=1,Vcpu=0;BFD session changed to Down. (SlotNumber=1, Discriminator=8209, Diagnostic=DetectDown, Applications=OSPF, ProcessPST=False, BindInterfaceName=Eth-Trunk10, InterfacePhysicalState=Down, InterfaceProtocolState=Down, PeerIp=12.1.1.1, SessType=D_IP_IF, RemoteDiscriminator=8209)
Mar 30 2018 11:46:54 NE40E_V6R7 %BFD/4/STACHG_TODWN(l)[7]:Slot=1,Vcpu=0;BFD session changed to Down. (SlotNumber=1, Discriminator=20, Diagnostic=DetectDown, Applications=None, ProcessPST=False, BindInterfaceName=GigabitEthernet1/1/6, InterfacePhysicalState=Down, InterfaceProtocolState=Down, PeerIp=224.0.0.184, SessType=S_IP_IF, RemoteDiscriminator=21)
Mar 30 2018 11:46:54 NE40E_V6R7 %PHY/4/PHY_STATUS_UP2DOWN(l)[8]:Slot=1,Vcpu=0;GigabitEthernet1/1/6 change status to down due to being shut.

transparent.gif Handling Process

1. Check the parameter of BFD for OSPF. The detect RX interval and TX interval use default parameter, by default, the interval is 10ms.

#

ospf 1 router-id 10.159.240.147

 bfd all-interfaces enable

 area 0.0.0.0

  network 12.1.1.0 0.0.0.3

#

#

ospf 1 router-id 10.159.240.148

 bfd all-interfaces enable

 area 0.0.0.0

 network 12.1.1.0 0.0.0.3

#

2. When shutdown one of memeber port of Eth-Trunk, the BFD state down and the OSPF peer rebuild.



transparent.gif Root Cause

The root cause is that the detect down performance of Eth-Trunk is 50ms on NE40E router. But the detect down interval of BFD is 10ms * 3 by default. When one of member port down, the BFD data still send to the port witch already been shutdown.

transparent.gif Solution

The solution:

1. When the cable is RJ45, configure the BFD RX and TX interval more than 500ms.

2. When the cable is fiber, configure the BFD RX and TX interval more than 100ms.

#

ospf 1 router-id 10.159.240.147

 bfd all-interfaces enable

 bfd all-interfaces min-tx-interval 100 min-rx-interval 100

 area 0.0.0.0

  network 12.1.1.0 0.0.0.3

#

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